解方程:(1)9(2x-1)^2-25(x+3)^2=0 (2)(3x+5)^2=(x-1)^2 (3)(2x-3)(2x+3)=x^2-6x+9^2是2次方的意思(1)9(2x-1)^2-25(x+3)^2=0(4) (2x+3)^2-(1-根号2)^2=0
问题描述:
解方程:(1)9(2x-1)^2-25(x+3)^2=0 (2)(3x+5)^2=(x-1)^2 (3)(2x-3)(2x+3)=x^2-6x+9
^2是2次方的意思
(1)9(2x-1)^2-25(x+3)^2=0
(4) (2x+3)^2-(1-根号2)^2=0
答
9(2x-1)^2-25(x+3)^2=0(6x-3)^2-(5x+15)^2=0(6x-3-5x-15)(6x-3+5x+15)=0(x-18)(11x-12)=0x=18 或x=12/11(3x+5)^2=(x-1)^2(3x+5)^2-(x-1)^2=0(3x+5+x-1)(3x+5-x+1)=0(4x+4)(2x+6)=0x=-1 或 x=-3(2x+3)=x^2-6x+9(2x-...